Analysis of Five-Fold Symmetry by Microtwinning in Rapidly Solidified Al-Mn Alloys

摘要

The properties of small ensembles of cyclically twinned, rhombohedrally distorted face centered cubic crystals are examined and shown to be consistent with reported experimentally determined diffraction patterns and images of rapidly solidified Al-Mn alloys exhibiting icosahedral symmetry. Limitations of previously reported refutations of twinning models are discussed. Proposals are made for definitive tests between microtwinning and quasicrystalline models of these structures. (ERA citation 11:003182)